Chhath puja is performed on Kartik Shukala Shashti, which is the sixth day of the month of Kartik in the Hindu Calendar, exactly 6 days after Deepawali. This falls typically in the month of October or November in the Gregorian Calendar. It is also celebrated in the summer (March- aApril), on Chaitra Shashti, some days after Holi; this event is called Chaiti Chhath. The former is more popular because winter is the usual festive season in North India, and Chhath, being an arduous observance, requiring the worshipers to fast without water for more than 24 hours, is tougher to undertake in the Indian winters.
Please find below the important dates of coming chhath puja Vrat 2010:-